Crown and bridge work.



No. 884,977. PATENTED APR. 14, 1908. C. M. B BOOS. CROWN ANDBRIDGE WORK. APPIFIOATION FILBD OUT. 17, 1904.

CASPER M. B. BOOS, OF MUSGATINE, IOWA.

"CROWN AND BRIDGE WCRK.

Specification of Letters Fatent.

Patented April 14, 1908.

. Application filed October 17, 1904. Serial No. 228,697.

To all whom it moi; concern:

Be it known that I, CASPER M. B. Boos,-

D. D. S., a citizen of the United States, residing at Muscatine, in the county of Muscatine and State of Iowa, have'invented a certain new and useful Cro Wu and Bridge Work, of which the following is a Specification.

The objects of my invention are to provide a simple, durable and inexpensive crown for teeth in which the porcelain forming the body of the tooth can be, readily and easily at fixing my crown to it.

tached to the backing without heating; that is, the backing is first molded into a desirable shape and the porcelain is then placed therein and maintained by means of pins extending through slots in the backing and engaging surface thereof which is away from the )orcelain, the body portion of these pins eing first embedded in the porcelain.

A further object is to provide a backing for teeth which will not have to be removed if the porcelain should at any time he severed from the backing, owing to the particular construction and arrangement of this baclc ing. By the use of my backing the necessity of removing the cap and pin which secure the backing to the teeth remains intact even though the porcelain body portion of the tooth is brokenfrom the backing, simply replacing the porcelain which has been broken away, the teeth are repaired, which process saves the'root of the tooth aflected materially.

My invention consists in certain details in the construction, arrangement and com bination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims and illustrated in the accompanying drawings in whih---- \Figure 1 is a perspective view of a comletetooth after. crown and backinghas been )laced upon the root. 1 Fig. 2 is a'sectiona view of the same. Fig. 3 is a sectional view of the root of they tooth prepared. for

ig. tional view of the capping with the pin for holding it in place he d ,to the tooth and my backing attached to it it appears when whole. Fig. 5 is a detail, sectional view'of the backing before it has been attached to the capping.- Fig, 6 is a sectional view of the backing with the pin protector attached to it first before the backing has been shaped to be attached to the capping. detail view of the body portion of the tooth so that by p 4 is a detail, scc- Fig. 7 is a which is attached to the backing showing the pins for connecting the tooth to the backing. Fig. 8 is a plan view of the backing before it has been shaped to be attached to the capping, and F 9 is a detail View of the protector for the pins.

Referring to the accompanying drawings, 1 have used the reference numeral 10 to indicate the root of an u per tooth in. which the crowning is cut 0 at its lower portion slightly above the lower portion of the gum. After the tooth has been cut off an opening 11 is bored into itwhich is designed to receive a pin, hereinafter described. A capping 12, having the in- 13 extending upwa'rdly from its centra portion, is provided, which is of the ordinary construction, except that it has an extension to which the porcelain tooth is to be secured. Firmly attached to the lower inner portion of the capping is a backing 14 having two slots 15 extending through it which are designed to receive the pins which are attached to the body portion of the tooth as more fully described 'iereinafter. Attached to the inner rear surface of the backing 14 is a pin protector '16 having two depressions 17 therein which are immediately behind the slots 15, so that the heads of pins which are placed in the slots 15 will be received in thedeprcssions 17 and said protector will protect the heads of these pins when these heads are in. the protector. Gold orother'metal. is then flowed around the rear of the backing and of the pin protector so as to make a perfectly smooth surface on the interior of the backing.

It will be clearly seen that on account of the-way in whichthe protector is is attached to the backing 14, there will be recesses 18 in which the pin heads will rest and these heads will also engage the inner rear surface of the backing 14 and be maintained securely relative thereto. When the capping and backing have been thus formed and secured relative to each other, a soldering material is placed in the opening H and around the interior of the capping and the pin 13 is insorted in the opening 11 and the capping is slipped over the exterior of the root 10 until.

two pins 21 are inserted into the body portion 20 from the back thereof, and the outer portions 22 of said pins are bent upwardly so that they can be inserted in the openings 15 and moved upwardly a slight distance and enter the recesses 18 when. the body portion 20 is in the proper position relative-to the backing 14 d the capping 12. When the pins are in this position and the body portion 20 has been thus shaped, soldering material is placed on the inner surface of the body 20 and around the heads of the pins 21. Then the heads 22 of these ins are inserted through the slots 15 and t 1e pins are moved upwardly so that the body engages the capping and a perfect crown is formed.

1 claim 1.,A tooth crown, comprising abacking 1 having slots therein, a body, pins in the body extending through the slots and engaging the rear surface of the backing, and a pin guard firmly attached to the backing, having two depressions therein immediately at the rear of the slots in the backing.

2. A capping having a pin extending outwardly from its central portion and substaie tially parallel with its sides, a backing designed to be securely fixed to the root of a tooth, a backing integral with the cappfing having slo'ts extending through it, a pin 1 guard secured to the backing over the pins, having depressions therein linmediatel'y at the rearof the slots in the backing, a body portion having pins extending rearwardly from it, an angular head thereon designed in pass through said slots and rest in the depressions between the protector and the backingv 3. A tooth crown, comprising a backing and slots therein, a body, pins in the body extending through the slots, an extension of the pin designed to engage the rear surface of the backing, and a pin guard attached to the rear surface of the backing.

.CASPER 31.13. B008.

Witnesses SYDNEY FT CnRis'rY, A. G. HAGUE. 

